The atoms didn't change we only added 2 different ones together. 2nd one is right
Answer:
B. K+cation
Explanation:
Not all that sure but hope it will help.

Metals such as iron, zinc, lead, copper, etc., are in the middle of the reactivity series. These are moderately reactive metals and are usually present as sulphides or carbonates. A metal is obtained from its ore by the processes of reduction or by electrolysis.
1.4 x 10^-6 would be the correct answer.